s390/sclp: clear upper register halves in _sclp_print_early

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commit f9c87a6f46 upstream.

If the kernel is compiled with gcc 5.1 and the XZ compression option
the decompress_kernel function calls _sclp_print_early in 64-bit mode
while the content of the upper register half of %r6 is non-zero.
This causes a specification exception on the servc instruction in
_sclp_servc.

The _sclp_print_early function saves and restores the upper registers
halves but it fails to clear them for the 31-bit code of the mini sclp
driver.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Martin Schwidefsky 2015-07-06 17:58:19 +02:00 • committed by Greg Kroah-Hartman

parent 5e62f6843f

commit 88b7166f0d

1 changed files with 4 additions and 0 deletions

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arch/s390/kernel/sclp.S

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